Circuit Diagram

FM Receiver

Published:2012/11/21 21:33:00 Author:muriel | Keyword: FM Receiver

An FM regenerative receiver using a single FET and one audio amplifier IC.   (View)

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2 Transistor Transmitter

Published:2012/11/21 21:32:00 Author:muriel | Keyword: 2 Transistor, Transmitter

A compact 2 transistor transmitter for use at VHF frequencies.   (View)

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6 x 6 Loop Antenna

Published:2012/11/21 21:31:00 Author:muriel | Keyword: 6 x 6 , Loop Antenna

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An AM voice transmitter

Published:2012/11/21 21:31:00 Author:muriel | Keyword: AM voice transmitter

An AM voice transmitter with variable tuning. The antenna circuit is also tuned and transmits via a long wire antenna. Please Note. It is illegal to transmit on the AM wavebands in most countries, as such this circuit is shown for educational purposes only.   (View)

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Optical fibre transmitting data coupling circuit

Published:2012/11/21 21:29:00 Author:Ecco | Keyword: Optical fibre, transmitting data , coupling circuit

The circuit shown in figure firstly converts input analog signal to frequency signal by V/F voltage-frequency converter, then it is sent to to optical fibers by light-emitting diodes. Length of optical fibre or polystyrene is decided by isolation voltage between digital or analog signal input end and photodiode.   (View)

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Bug Detector

Published:2012/11/21 21:30:00 Author:muriel | Keyword: Bug Detector

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A simple modulator circuit for symbol generator display

Published:2012/11/21 21:22:00 Author:Ecco | Keyword: simple modulator , symbol generator , display

Illustrating the the LM1889 integrated chip demodulator circuit , few external components required. LM1889 is a dedicated circuit used as the interface element of TV antenna terminal for audio, color, contrast and brightness video modulation. And it is used as demodulator circuit here for displayed signal generator.   (View)

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Zhenyu XSX - BIII electronic disinfecting cabinet ozone generator circuit

Published:2012/11/21 21:15:00 Author:Ecco | Keyword: Zhenyu , electronic disinfecting cabinet, ozone generator

The ozone generator is the core circuit of the disinfection cabinet, while the core element is ozone glass tubes Q1 and Q2. And they form the ozone generating circuit with bidirectional thyristor VS and boost transformer T. When the AC power supply is in the negative half cycle, the diode VD3 gets conduction, VD4 is deadline, VS is turned off, then the power is charging for C9, and charging current flowing direction is AC power supply L side → R11 → L1 → C9 → N terminal. When the power supply is in the positive half cycle, VD3 is cut off, VD4 gets conduction, VS gets conduction, and the sufficient charge C9 makes instantaneous discharge through L1 → VS, then L1 generates larger transient discharge current induction in L2 and higher induced voltage.   (View)

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Refrigerator automatic protector

Published:2012/11/21 21:05:00 Author:Ecco | Keyword: Refrigerator, automatic protector

BT33 forms a delay circuit. When the power is turned on, the relay J1 does not work, contact J1-2 disconnects for five minutes, due to the charging voltage rise of the capacitor C1, BT33 gets conduction, relay J1 pulls, J1 -2 contact gets closure, then the refrigerator gets power, which is protected by J1-1 normally open contact. Under the case with normal voltage, D2, BG2 get conduction, D3, and D4, and BG3 are cutoff, relay J2 does not work.   (View)

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The motor overheating language newspaper called circuit

Published:2012/11/21 20:48:00 Author:Ecco | Keyword: motor overheating, language newspaper called

It is composed of temperature sensor, electronic switch circuit and language utterance circuit. When motor fails to run in the hot season or at room temperature, the motor will often appear overheating. The circuit can issue the sound of beep , please note to remind duty personnel.   (View)

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The ATL-3| Loop Antenna

Published:2012/11/21 21:29:00 Author:muriel | Keyword: ATL-3 Loop Antenna

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450-800MHz UHF Preamplifier

Published:2012/11/21 21:29:00 Author:muriel | Keyword: 450-800MHz , UHF Preamplifier

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An low power FM Transmitter

Published:2012/11/21 21:27:00 Author:muriel | Keyword: low power , FM Transmitter

An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier.   (View)

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4 Transistor Transmitter

Published:2012/11/21 21:24:00 Author:muriel | Keyword: 4 Transistor, Transmitter

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Simple Field Strength Meter

Published:2012/11/21 21:23:00 Author:muriel | Keyword: Simple , Field Strength Meter

This Field Strength Meter is simple and also quite sensitive. It uses an ordinary digital voltmeter to measure RF signal strength up to a few hundred MHz.   (View)

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Field Strength Meter

Published:2012/11/21 21:22:00 Author:muriel | Keyword: Field Strength Meter

This is a wide band signal strength meter circuit which responds to small changes in RF energy, designed to be used for the VHF spectrum and will respond to AM or FM modulation or just a plain carrier wave.   (View)

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A small FM voice transmitter for Band 2 VHF

Published:2012/11/21 21:22:00 Author:muriel | Keyword: FM voice transmitter, Band 2 VHF

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2 Transistor FM Transmitter

Published:2012/11/21 21:16:00 Author:muriel | Keyword: 2 Transistor, FM Transmitter

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SW Receiver Using ZN414

Published:2012/11/21 21:15:00 Author:muriel | Keyword: SW Receiver , ZN414

A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands.   (View)

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ZN414 Portable Receiver

Published:2012/11/21 21:15:00 Author:muriel | Keyword: ZN414 , Portable Receiver

An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout.   (View)

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